Open AccessGeneration of multi-mode squeezed vacuum using pulse pumped fiber optical parametric amplifiers
Author(s) -
Nannan Liu,
Yuhong Liu,
Jiamin Li,
Lei Yang,
Xiaoying Li
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.002125
Subject(s) - optics , physics , multi mode optical fiber , ultrashort pulse , squeezed coherent state , quantum noise , homodyne detection , optical amplifier , raman scattering , optical parametric amplifier , fiber laser , optical parametric oscillator , optical fiber , laser , quantum , coherent states , raman spectroscopy , quantum mechanics
Multimode squeezed states are essential resources in quantum information processing and quantum metrology with continuous variables. Here we present the experimental generation of squeezed vacuum via the degenerate four wave mixing realized by pumping a piece of dispersion shifted fiber with mode-locked ultrafast pulse trains. The noise fluctuation is lower than the shot noise limit by 1.1 ± 0.08 dB (1.95 ± 0.17 dB after correction for detection losses). The detailed investigation illustrates that the results can be further improved by suppressing Raman scattering and by reshaping the spectrum of the local oscillator to achieve the required mode-matching of the homodyne detection system. Our study is useful for developing a compact fiber source of multi-mode squeezed vacuum.